responsible for keeping water from dripping through the grouphead and portafilter. During the warm-up and achieving operating pressure, water drips from the grouphead to the portafilter. Cylinder sleeve O-ring seal? Piston V gaskets? Worn upper group sleeve? All parts except group sleeve replaced last year. Just trying to isolate the problem. TIA.

The one that holds back the boiler pressure and prevents the group head from raining on your drip-tray is the upper of the two piston gaskets. The upper one has the groove facing up and prevents water from passing the piston downward. The lower one has the groove facing down and prevens the piston from passing the water, therefore forcing the water down when you bring the lever down. Replace them both, though. And since you're pulling the piston out, you might as well replace the little clear one around the shaft as well, it's probably the same age and nearly as hard.

Thanks for the responses. I'm going to pull the group head screen off, turn the machine on and see if I can tell if the leak is coming from within the piston or outside of the piston. I'm due for the annual gasket replacements. Thanks again.

Symbols: = New Posts since your last visit = No New Posts since last visit = Newest post

Forum Rules:No profanity, illegal acts or personal attacks will be tolerated in these discussion boards.No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum.No SEO style postings will be tolerated. SEO related posts will result in immediate ban from CoffeeGeek.No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum.Who Can Read The Forum? Anyone can read posts in these discussion boards.Who Can Post New Topics? Any registered CoffeeGeek member can post new topics.Who Can Post Replies? Any registered CoffeeGeek member can post replies.Can Photos be posted? Anyone can post photos in their new topics or replies.Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts.Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.